Installation Requirements; Torque Requirements; Pipe Length And Elevation - Lennox MMA018SM4 Service Manual

14. Installation Requirements

14.1. Torque Requirements

Refrigerant pipe diameter is different according to indoor unit to be connected. When using the extension pipe, refer to
the tables below.
When refrigerant pipe diameter is different from that of the outdoor unit connector (18K indoor unit) an additional adapter
is required.
Outside Diameter
MM
Ф6.35
Ф9.52
Ф12.7

14.2. Pipe Length and Elevation

Maximum piping length and height difference.
Model
18K
24K
24K
30K
36K
48K
Length
Max. length for all rooms (m)
Max. length for one IU (m)
Max. height difference between IU and
OU (m)
Max. height difference between IUs (m)
CAUTION
Table 6.
Inches
1/4
3/8
1/2
Table 7. Pipe Diameter - MM (Inches)
Indoor Unit
Pipe Diameter (mm/inches)
Liquid
Gas
Liquid
Gas
1 drive 2
1 drive 3
1 drive 4
1 drive 5
Table 8. Line Set Length - Meters (Feet)
1 Drive 2
40 (131)
25 (82)
15 (49.2)
10 (33)
Torque
Torque
v.cm
1500 (153kgf.cm)
2500 (255kgf.cm
3500 (357kgf.cm)
6.35 (1/4)
12.7 (1/2)
9.52 (3/8)
15.9 (5/8)
1 Drive 3
60 (197)
30 (98)
15 (49.2)
10 (33)
65
Additional Tightening
N.cm
1600 (163kgf.cm)
2600 (265kgf.cm)
3600 (367kgf.cm)
Extension Pipe Diameter (mm/inches)
Liquid
Gas
Liquid
Gas
Liquid 6.35 (1/4) *2
Gas 9.52 (3/8) *2
Liquid 6.35 (1/4) *3
Gas 9.52 (3/8) *3
Liquid 6.35 (1/4) *4
9.52 (3/8) *3
Gas
12.7 (1/2) *1
Liquid 6.35 (1/4) *5
9.52 (3/8) *3
Gas
12.7 (1/2) *2
1 Drive 4
80 (262)
35 (115)
15 (49.2)
10 (33)
6.35 (1/4)
12.7 (1/2)
9.52 (3/8)
15.9 (5/8)
1 Drive 5
80 (262)
35 (115)
15 (49.2)
10 (33)